fix for pkg_resources missing on 3.12

Author: Jeff Whitaker

test/tst_multifile.py

@@ -5,7 +5,7 @@
 from numpy import ma
 import tempfile, unittest, os, datetime
 import cftime
-from pkg_resources import parse_version
+from packaging.version import Version
 
 nx=100; ydim=5; zdim=10
 nfiles = 10
@@ -138,7 +138,7 @@ def runTest(self):
         assert_equal(T.typecode(), t.typecode())
         # skip this until cftime pull request #55 is in a released
         # version (1.0.1?). Otherwise, fix for issue #808 breaks this
-        if parse_version(cftime.__version__) >= parse_version('1.0.1'):
+        if Version(cftime.__version__) >= Version('1.0.1'):
             assert_array_equal(cftime.num2date(T[:], T.units, T.calendar), dates)
         assert_equal(cftime.date2index(datetime.datetime(1980, 1, 2), T), 366)
         f.close()

test/tst_multifile2.py

@@ -5,7 +5,7 @@
 from numpy import ma
 import tempfile, unittest, os, datetime
 import cftime
-from pkg_resources import parse_version
+from packaging.version import Version
 
 nx=100; ydim=5; zdim=10
 nfiles = 10
@@ -106,7 +106,7 @@ def runTest(self):
         # Get the real dates
         # skip this until cftime pull request #55 is in a released
         # version (1.0.1?). Otherwise, fix for issue #808 breaks this
-        if parse_version(cftime.__version__) >= parse_version('1.0.1'):
+        if Version(cftime.__version__) >= Version('1.0.1'):
             dates = []
             for file in self.files:
                 f = Dataset(file)